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TrueTouch Gen4 claims best gloved-finger tracking

31 May 2013

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The TrueTouch Gen4 touchscreen controller family released by Cypress Semiconductor Corp. now has advanced features, which include tracking of gloved fingers on capacitive touchscreens.

The Gen4 family now also offers new functionality including passive stylus support to capture handwriting and signatures accurately and proximity detection that senses an object approaching the touchscreen and powers down the display before contact to avoid accidental touches. The capacitive-based proximity detection feature eliminates the need for infrared (IR) sensors and provides significant cost savings. These advanced features supplement Gen4's best-in-class water rejection and seamless operation in noisy environments.

The Gen4 TMA467 controller tracks up to 10 fingers in thin gloves and two fingers with thicker gloves, such as those used by skiers. It delivers accuracy and linearity for gloves of different materials and thicknesses. It automatically switches between glove and finger tracking without any intervention.

The Gen4 TMA468 controller supports passive styli with tips as small as 2mm, enabling touchscreens to capture characters as small as 7mm. This capability is important for writing in languages that require enhanced character recognition for reliable text input, such as Chinese and Japanese. The controller delivers a high degree of accuracy and linearity, along with the fast refresh rates required for handwriting and signature capture.

The Gen4 TMA466 controller's proximity sensing detects objects such as a user's face up to 25mm away from the screen and disables detection when a user is on a call in case their face touches the screen. It also instructs the host to turn off the display to save power and prolong battery life. This eliminates the need for stand-alone IR proximity sensors and reduces system costs.


An array of technologies

Gen4 utilises Cypress's patented ability to execute both self-capacitance and mutual-capacitance measurements in the same device—and switch dynamically between the two in application. This ability enables glove tracking, stylus support, and face detection features, as well as TrueTouch's water rejection capability.

Gen4 is the world's only controller family with a built-in 10V transmitter to drive the touch panel at 10V. Because signal-to-noise ratio (SNR) is directly proportional to the voltage at which the panel is driven, this technology allows Gen4 solutions to sense smaller signals than competitors in the presence of high noise sources, eliminating disruptions in performance. Gen4 controls touchscreens up to 6in in smartphones, digital cameras, media players and touchscreens up to 10.1in in e-readers and tablets.

Availability

The TrueTouch Gen4 TMA466, TMA467, and TMA468 controllers are now available to lead customers.




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